Axial Dispersion and Phase Holdup Characteristics in Reciprocating Plate Extraction Columns

Abstract

Axial dispersion and phase holdup characteristics have been determined in a 0.102-m i.d * 3.5 m high QVF glass column. THe axial dispersion coefficient decreases with increasing reciprocation frequency(f) and amplitude(A) in the inhomogeneous dispersed phase flow regime, whereas it increases in the emulsion flow regime. THe axial dispersion coefficient with a perforated plate increases with continuous and dispersed phase velocities. However, the effect of phase velocities on axial dispersion is less pronounced with the fan lpate. THe axial dispersion coefficient can be correlated withe A2f, fluid velocities, and the free fractional opening area of the plates. The dispersed phase holdup increases with an increase in agitation intensity,Af, and decreases with the free opening area of the plate.